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Keywords
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Nanohybrid, Magnetite, Polystyren, Magnetic solid phase extraction, Sample pretreatment
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Abstract
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A nanohybrid based on polystyrene derivatives and magnetite was introduced as a new sorbent
for pretreatment and analysis of the trace silver in environmental samples. Flame atomic
absorption spectrometry was used for detection of the analyte after desorption of the extracted
analytes by hydrochloric acid solution. Different variables affecting the separation/preconcentration
conditions of the analyte, including pH of the sample solution, buffer
concentration, amount of the sorbent, sample volume, extraction and desorbtion times, and
elution conditions were investigated and optimized. Under the optimized conditions, linear
calibration graph was obtained in the range of 0.01–0.11 mg L‒1 silver, with the correlation
coefficient of 0.998. The enrichment factor of 50 was achieved, leading to limit of quantification
of 10 μg L-1. The relative standard deviation for the determination of silver was 2.37% (n=6,
silver concentration; 80 μg L‒1 ).The method was successfully applied to determine silver in
natural waters and satisfactory recoveries were obtained in the range of 94–105%.
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